Wardens at the Kenya’s Mara Conservancy solved a revenue loss problem by teaming up with their revenue management company to create a smartphone app that lets them check tourists’ ticket and payment status by entering the vehicle license plate numbers. Obtaining up-to-date information about the tourists and the validity of their ticket from their patrol car saves the rangers time and avoids their having to interrupt a group’s safari. The rangers address any discrepancies first with the tour guide and involve tourists only as a last resort, which has nearly eliminated cheating and enabled the Reserve to boost the revenue it retains. Nature reserves frequently operate with scarce resources, relying on revenue from tourism or donations for their survival. When managers of the Mara Triangle portion of Kenya’s renowned Maasai Mara National Reserve ’s assessed the revenue it was...